bertypunto
New member
- Joined
- Jan 10, 2010
- Messages
- 17
- Points
- 6
Big thanks to Humour for his help , we managed to get a comparison of fuel pressure and cranking speed from his 1.3 multijet which shows my car definitely has a much slower rate of pressure increase when starting and achieves a significantly lower pressure for the same cranking speed. For reference to any others reading this thread with a similar issue, the fuel rail pressure when cold is about 198 bar at 165 rpm on a good engine. I am getting around 180 bar at 194 rpm.
As expected , on a healthy engine the cranking speed never reaches maximum before the fuel pressure is sufficient for the engine to start ( As seen on Humour's car : 198 bar at 164 rpm)
When the engine is hot on my car , I manage a higher cranking speed but the pressure struggles to get above 150 bar. Having spoken to diesel specialists I am advised a diesel needs between 150 -160 bar to start. Since i am borderline on the required pressure even with the engine turning at its maximum cranking speed. it would seem the issue points to the fuel pump.
As expected , on a healthy engine the cranking speed never reaches maximum before the fuel pressure is sufficient for the engine to start ( As seen on Humour's car : 198 bar at 164 rpm)
When the engine is hot on my car , I manage a higher cranking speed but the pressure struggles to get above 150 bar. Having spoken to diesel specialists I am advised a diesel needs between 150 -160 bar to start. Since i am borderline on the required pressure even with the engine turning at its maximum cranking speed. it would seem the issue points to the fuel pump.